PC won't format 250GB hard drive

I attempted to add a 250 GB hard drive to my PC, 3.0 Ghz, GA-8S648FX MB with 1 Gig DDR Ram. When I boot my PC and go into the bios, it sees the PC, however when the PC boots it doesn't show it in control panel or in "My Computer". I am running Windows XP Pro 2nd Edition and am frustrated. I have the most current bios for my motherboard and Gigabyte says it should be no problem on their end. So what am I doing wrong? I have tried both setting drives as Cable Select and also Master/Slave. I have tried setting it up with the original Windows XP Pro disk but it only sees 137MB. Any ideas? I got a real good deal so I bought 2 of these 250 GB drives for my PCs, too bad they can't see the. BTW, both PCs are the same motherboard only difference is that one of the PCs is a 2.8 Ghz CPU (INTEL). Thanks

From Windows go to Start>My Computer....right click it and select Manage.Now double click on Disk Management.You should see the drive listed as something like raw......right click it and select format(use NTFS for a large drive) and let Windows format the drive.You wont see the new drive in Device Manager or My Computer until it is formatted.

Alternative do as Totally-Braindead suggests and download a tool from the drive manufacturer or use a third party disc manager such as Acronis True Image or Partition Magic to partition and format the drive.